Samer Houri, Rachid Haouari, Bart P. Weekers, Veronique Rochus
This work investigates the dynamics and experimentally extracts the acoustic coupling between a pair of microelectromechanical ultrasound transducers (MUTs) that are immersed in water and acoustically coupled through the fluid medium. A series of these transducer pairs with varying diameters (and thus resonance frequency) and pitch separation (and thus coupling strength) are fabricated and measured. This work presented here models and quantifies the open-loop coupling between the MEMS transducer pairs and its dependence on pitch. Furthermore, a gain feedback loop is systematically applied to one of the device pair, the dynamics of the acoustically coupled gain-loss system is investigated, and the formation of an exceptional point or of an Hopf bifurcation is equally used to quantify the acoustic coupling coefficient. This work provides an exploration of the formation of exceptional points in acoustically coupled MEMS transducers as well as three experimental means to study acoustic coupling in MUT transducers: via open-loop dynamics, Hopf bifurcation, and the formation of an exceptional point.
{"title":"Acoustically coupled MEMS transducer pairs with loss and gain","authors":"Samer Houri, Rachid Haouari, Bart P. Weekers, Veronique Rochus","doi":"10.1063/5.0311884","DOIUrl":"https://doi.org/10.1063/5.0311884","url":null,"abstract":"This work investigates the dynamics and experimentally extracts the acoustic coupling between a pair of microelectromechanical ultrasound transducers (MUTs) that are immersed in water and acoustically coupled through the fluid medium. A series of these transducer pairs with varying diameters (and thus resonance frequency) and pitch separation (and thus coupling strength) are fabricated and measured. This work presented here models and quantifies the open-loop coupling between the MEMS transducer pairs and its dependence on pitch. Furthermore, a gain feedback loop is systematically applied to one of the device pair, the dynamics of the acoustically coupled gain-loss system is investigated, and the formation of an exceptional point or of an Hopf bifurcation is equally used to quantify the acoustic coupling coefficient. This work provides an exploration of the formation of exceptional points in acoustically coupled MEMS transducers as well as three experimental means to study acoustic coupling in MUT transducers: via open-loop dynamics, Hopf bifurcation, and the formation of an exceptional point.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"26 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Exciton polaritons represent hybrid bosonic quasiparticles that emerge from the strong coupling between excitons and photons. Their distinctive properties provide a robust platform for investigating light–matter interactions. These properties facilitate spontaneous coherence and pronounced nonlinear optical phenomena, making them highly suitable for exploring thresholdless lasing, ultrafast optical switching, and quantum fluid dynamics. Organic semiconductors are especially advantageous for polaritonic applications, owing to their high exciton binding energies and superior processability. In this study, we report a microcavity incorporating DPAVBi plate-like single crystals in a distinct polymorphic phase, achieving a lasing threshold approximately 60 times lower than that of previously reported DPAVBi micro-belts. Furthermore, we demonstrate the emergence of exciton–polariton vortex modes within this organic microcavity at room temperature. Our findings establish a viable pathway for investigating low-power organic photonic lasers and demonstrate their potential utility in quantum information processing and next-generation organic optoelectronic devices.
{"title":"Ultralow threshold polariton laser and vortex formation in an organic microcavity at room temperature","authors":"Dongxue Wang, Jiaxiang Mu, Chenxi Yang, Yao Li, Xiaokun Zhai, Zuofang Feng, Qiang Ai, Chunzi Xing, Xinmiao Yang, Yilong Lei, Haitao Dai, Liefeng Feng, Tingge Gao","doi":"10.1063/5.0313470","DOIUrl":"https://doi.org/10.1063/5.0313470","url":null,"abstract":"Exciton polaritons represent hybrid bosonic quasiparticles that emerge from the strong coupling between excitons and photons. Their distinctive properties provide a robust platform for investigating light–matter interactions. These properties facilitate spontaneous coherence and pronounced nonlinear optical phenomena, making them highly suitable for exploring thresholdless lasing, ultrafast optical switching, and quantum fluid dynamics. Organic semiconductors are especially advantageous for polaritonic applications, owing to their high exciton binding energies and superior processability. In this study, we report a microcavity incorporating DPAVBi plate-like single crystals in a distinct polymorphic phase, achieving a lasing threshold approximately 60 times lower than that of previously reported DPAVBi micro-belts. Furthermore, we demonstrate the emergence of exciton–polariton vortex modes within this organic microcavity at room temperature. Our findings establish a viable pathway for investigating low-power organic photonic lasers and demonstrate their potential utility in quantum information processing and next-generation organic optoelectronic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"93 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Bohus, Á. Mohácsi, A. P. Farkas, L. Égerházi, T. Szörényi
We demonstrate a single-shot method for probing ultrafast laser–matter interactions using unfocused multi-terawatt femtosecond beams. The intrinsic fluence inhomogeneity of the beams is exploited to accomplish parallel, spatially encoded experiments performed under strictly identical conditions across a wide energy range in a single step, enabling systematic mapping of energy-dependent surface responses without beam scanning. As proof of the technique, the large set of simultaneously collected data points below, at, and above the threshold inherently allows for a threshold evaluation approach, different from both the diameter/depth regression analysis and the statistical method. Using copper as a test system, we quantify the fluence dependence of reflectance and morphology and identify a multi-pulse optical threshold of 0.020 J/cm2, coinciding with the onset of ablation confirmed by SEM imaging. The minimum specular reflectance observed, around 0.10%, favorably compares to the respective figures reported. Applying this parallelized surface mapping technique with high-energy laser systems featuring suitably large beam diameters thereby provides a versatile platform for exploring ultrafast laser-induced surface responses, with potential applications in material design, surface engineering, and optical damage studies.
{"title":"Surface nanoprocessing with unfocused beams of high-energy femtosecond lasers: A tool to produce surface characteristics libraries","authors":"J. Bohus, Á. Mohácsi, A. P. Farkas, L. Égerházi, T. Szörényi","doi":"10.1063/5.0306168","DOIUrl":"https://doi.org/10.1063/5.0306168","url":null,"abstract":"We demonstrate a single-shot method for probing ultrafast laser–matter interactions using unfocused multi-terawatt femtosecond beams. The intrinsic fluence inhomogeneity of the beams is exploited to accomplish parallel, spatially encoded experiments performed under strictly identical conditions across a wide energy range in a single step, enabling systematic mapping of energy-dependent surface responses without beam scanning. As proof of the technique, the large set of simultaneously collected data points below, at, and above the threshold inherently allows for a threshold evaluation approach, different from both the diameter/depth regression analysis and the statistical method. Using copper as a test system, we quantify the fluence dependence of reflectance and morphology and identify a multi-pulse optical threshold of 0.020 J/cm2, coinciding with the onset of ablation confirmed by SEM imaging. The minimum specular reflectance observed, around 0.10%, favorably compares to the respective figures reported. Applying this parallelized surface mapping technique with high-energy laser systems featuring suitably large beam diameters thereby provides a versatile platform for exploring ultrafast laser-induced surface responses, with potential applications in material design, surface engineering, and optical damage studies.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"79 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gregor Skobjin, Javier Rial, Sebastian Beckert, Helena Reichlova, Vincent Baltz, Lisa Michez, Richard Schlitz, Michaela Lammel, Sebastian T. B. Goennenwein
In ferromagnets, the anomalous Hall effect (AHE) can exhibit time-dependent relaxation, including magnetic aftereffect and Barkhausen jumps, and thus provide insights into magnetic susceptibility and domain dynamics. Recently, a finite AHE has also been reported in compensated collinear magnets—termed altermagnets—which, due to their spin and crystal symmetries, combine properties usually attributed to either ferromagnets or antiferromagnets. To date, a possible time-dependent relaxation of the AHE in altermagnets has not been explored. Here, we study the Hall effect response of micrometer-scale Hall bars patterned into thin films of Mn5Si3, an altermagnet featuring a finite spontaneous AHE. Recording transport data as a function of time, at a fixed magnetic field magnitude, we observe a relaxation of the Hall voltage qualitatively and quantitatively similar to the magnetic aftereffect in ferromagnetic films. In addition, the Hall voltage time traces feature clear unidirectional jumps, which we interpret as Barkhausen jumps, i.e., as experimental evidence for abrupt reorientations of Hall vector domains in Mn5Si3. A quantitative analysis yields a Barkhausen length of around 18 nm in the Hall bar devices with the smallest width of 100 nm.
{"title":"Magnetic aftereffect and Barkhausen jumps in thin altermagnetic Mn5Si3 films","authors":"Gregor Skobjin, Javier Rial, Sebastian Beckert, Helena Reichlova, Vincent Baltz, Lisa Michez, Richard Schlitz, Michaela Lammel, Sebastian T. B. Goennenwein","doi":"10.1063/5.0314005","DOIUrl":"https://doi.org/10.1063/5.0314005","url":null,"abstract":"In ferromagnets, the anomalous Hall effect (AHE) can exhibit time-dependent relaxation, including magnetic aftereffect and Barkhausen jumps, and thus provide insights into magnetic susceptibility and domain dynamics. Recently, a finite AHE has also been reported in compensated collinear magnets—termed altermagnets—which, due to their spin and crystal symmetries, combine properties usually attributed to either ferromagnets or antiferromagnets. To date, a possible time-dependent relaxation of the AHE in altermagnets has not been explored. Here, we study the Hall effect response of micrometer-scale Hall bars patterned into thin films of Mn5Si3, an altermagnet featuring a finite spontaneous AHE. Recording transport data as a function of time, at a fixed magnetic field magnitude, we observe a relaxation of the Hall voltage qualitatively and quantitatively similar to the magnetic aftereffect in ferromagnetic films. In addition, the Hall voltage time traces feature clear unidirectional jumps, which we interpret as Barkhausen jumps, i.e., as experimental evidence for abrupt reorientations of Hall vector domains in Mn5Si3. A quantitative analysis yields a Barkhausen length of around 18 nm in the Hall bar devices with the smallest width of 100 nm.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"100 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wenhui Xu, Guibin Li, Hui Li, Qi Tan, Yufei Liu, Jie Li, Hang Xu, Yan Zhang, Jianquan Yao
Terahertz (THz) planar focal spot scanning is critical for imaging, sensing, and optical routing, but traditional approaches suffer from bulkiness or limited tunability. Herein, we propose a cascaded metasurface device with two mechanically rotatable dielectric layers (M1 and M2) to achieve dynamic focal scanning. The core mechanism relies on rotation-induced phase superposition: tuning angles α1 and α2 modulates the combined phase distribution, enabling continuous in-plane focal displacement. Simulations demonstrate controllable scanning under M2 rotation (α1 = 0°, α2: −75° to 75°) and opposite co-rotation (α1 = −α2: −60° to 60°), with stable focal length and efficiency. Experimental characterization via a THz near-field system confirms close agreement between simulated and measured scanning trajectories, verifying the device's predictability and reliability. This passive scheme offers simplicity, large tuning range, and broadband compatibility, avoiding external energy supplies. The proposed cascaded platform enriches THz optical manipulation tools and facilitates integration into dynamic imaging, sensing, and beam steering systems.
{"title":"Dynamic terahertz focal planar scanning via cascaded metasurfaces","authors":"Wenhui Xu, Guibin Li, Hui Li, Qi Tan, Yufei Liu, Jie Li, Hang Xu, Yan Zhang, Jianquan Yao","doi":"10.1063/5.0315215","DOIUrl":"https://doi.org/10.1063/5.0315215","url":null,"abstract":"Terahertz (THz) planar focal spot scanning is critical for imaging, sensing, and optical routing, but traditional approaches suffer from bulkiness or limited tunability. Herein, we propose a cascaded metasurface device with two mechanically rotatable dielectric layers (M1 and M2) to achieve dynamic focal scanning. The core mechanism relies on rotation-induced phase superposition: tuning angles α1 and α2 modulates the combined phase distribution, enabling continuous in-plane focal displacement. Simulations demonstrate controllable scanning under M2 rotation (α1 = 0°, α2: −75° to 75°) and opposite co-rotation (α1 = −α2: −60° to 60°), with stable focal length and efficiency. Experimental characterization via a THz near-field system confirms close agreement between simulated and measured scanning trajectories, verifying the device's predictability and reliability. This passive scheme offers simplicity, large tuning range, and broadband compatibility, avoiding external energy supplies. The proposed cascaded platform enriches THz optical manipulation tools and facilitates integration into dynamic imaging, sensing, and beam steering systems.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"55 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaoqi Zi, Shaoguang Zhao, Hang Deng, Qiman Zhang, Ziheng Zhao, Li Tao
Polarimetric optical encryption enables parallel information channels and enhanced eavesdropping prevention capabilities, improving data transmission capacity and information security. However, conventional systems rely heavily on bulky and discrete components such as polarizers and wave plates, which complicate device integration and miniaturization. To address these limitations, we demonstrate a polarization-resolved photodetector based on the heterostructure of GeSe/2H-MoTe2. Leveraging the type-II energy band arrangement and strong interface coupling between anisotropic GeSe and ambipolar 2H-MoTe2 layers, the device enables efficient carrier separation and broadband light response from visible to near-infrared regions. Under 638 nm irradiation, the device achieves self-powered operation with a responsivity of 1.98 A/W, a specific detectivity of 1.15 × 1011 Jones, and an external quantum efficiency of 387%. Moreover, the polarization ratio of the device is electrically tunable (1.47–3.17), enabling the realization of an XNOR-based optical encryption system in which polarization angles and gate voltages serve as optical data bits and electrical keys, respectively. This work not only presents an efficient strategy for enhancing polarization sensitivity and broadband self-powered detection but also establishes a route toward secure and reconfigurable optoelectronic information processing based on 2D van der Waals (vdW) heterostructures.
偏振光加密实现了信息通道并行，增强了防窃听能力，提高了数据传输能力和信息安全性。然而，传统的系统严重依赖于体积庞大且离散的组件，如偏振器和波片，这使得设备集成和小型化变得复杂。为了解决这些限制，我们展示了一种基于GeSe/2H-MoTe2异质结构的偏振分辨光电探测器。利用各向异性GeSe和双极性2H-MoTe2层之间的ii型能带排列和强界面耦合，该器件实现了从可见光到近红外区域的高效载流子分离和宽带光响应。在638 nm辐照下，器件实现自供电运行，响应度为1.98 a /W，比探测率为1.15 × 1011 Jones，外量子效率为387%。此外，器件的偏振比是电可调的（1.47-3.17），可以实现基于xnor的光加密系统，其中偏振角和栅极电压分别作为光数据位和电密钥。这项工作不仅提出了提高偏振灵敏度和宽带自供电检测的有效策略，而且为基于二维范德华（vdW）异质结构的安全和可重构光电信息处理建立了一条途径。
{"title":"Electrical control of polarization-resolved photodetection in GeSe/MoTe2 heterostructures for optoelectronic encryption","authors":"Xiaoqi Zi, Shaoguang Zhao, Hang Deng, Qiman Zhang, Ziheng Zhao, Li Tao","doi":"10.1063/5.0320086","DOIUrl":"https://doi.org/10.1063/5.0320086","url":null,"abstract":"Polarimetric optical encryption enables parallel information channels and enhanced eavesdropping prevention capabilities, improving data transmission capacity and information security. However, conventional systems rely heavily on bulky and discrete components such as polarizers and wave plates, which complicate device integration and miniaturization. To address these limitations, we demonstrate a polarization-resolved photodetector based on the heterostructure of GeSe/2H-MoTe2. Leveraging the type-II energy band arrangement and strong interface coupling between anisotropic GeSe and ambipolar 2H-MoTe2 layers, the device enables efficient carrier separation and broadband light response from visible to near-infrared regions. Under 638 nm irradiation, the device achieves self-powered operation with a responsivity of 1.98 A/W, a specific detectivity of 1.15 × 1011 Jones, and an external quantum efficiency of 387%. Moreover, the polarization ratio of the device is electrically tunable (1.47–3.17), enabling the realization of an XNOR-based optical encryption system in which polarization angles and gate voltages serve as optical data bits and electrical keys, respectively. This work not only presents an efficient strategy for enhancing polarization sensitivity and broadband self-powered detection but also establishes a route toward secure and reconfigurable optoelectronic information processing based on 2D van der Waals (vdW) heterostructures.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"10 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yingxue Han, Shang Peng, Mei Li, Jun Yuan, Tingting Zhao, Bohao Zhao, Yanlong Chen, Qi Feng, Jiao An, Chuanlong Lin
Metastable polymorphs of silicon exhibit direct and narrow band gaps, offering broad application potential. The transition kinetics in the formation of metastable Si have been extensively studied, but the relationship between transition conditions and nanostructures of product phases remains unclear. Here, we report diverse nanostructures of body-centered cubic (bc8) Si formed by rapid decompression of beta-Sn Si at different rates. High-resolution transmission electron microscopy images show slow decompression results in the formation of bc8 nanocrystals with long-range order and abundant interfacial defects, including dislocation, twin, stacking fault, and internal lattice strain. In contrast, rapid decompression generates bc8 nanoclusters with a macroscopic amorphous characteristic, as evidenced by the broad diffuse halo in fast Fourier transform pattern. Statistical analysis of the size distribution shows that the grain size decreases with the increasing decompression rate, indicating a clear rate-dependent behavior. These findings provide structural evidence and mechanistic insights into the kinetically controlled formation of the metastable nanostructures for promising applications.
{"title":"Diverse nanostructures of bc8 silicon mediated by controllable transition kinetics of beta-Sn silicon","authors":"Yingxue Han, Shang Peng, Mei Li, Jun Yuan, Tingting Zhao, Bohao Zhao, Yanlong Chen, Qi Feng, Jiao An, Chuanlong Lin","doi":"10.1063/5.0322983","DOIUrl":"https://doi.org/10.1063/5.0322983","url":null,"abstract":"Metastable polymorphs of silicon exhibit direct and narrow band gaps, offering broad application potential. The transition kinetics in the formation of metastable Si have been extensively studied, but the relationship between transition conditions and nanostructures of product phases remains unclear. Here, we report diverse nanostructures of body-centered cubic (bc8) Si formed by rapid decompression of beta-Sn Si at different rates. High-resolution transmission electron microscopy images show slow decompression results in the formation of bc8 nanocrystals with long-range order and abundant interfacial defects, including dislocation, twin, stacking fault, and internal lattice strain. In contrast, rapid decompression generates bc8 nanoclusters with a macroscopic amorphous characteristic, as evidenced by the broad diffuse halo in fast Fourier transform pattern. Statistical analysis of the size distribution shows that the grain size decreases with the increasing decompression rate, indicating a clear rate-dependent behavior. These findings provide structural evidence and mechanistic insights into the kinetically controlled formation of the metastable nanostructures for promising applications.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"31 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pan Shi, Yao Chen, Tianyu Xie, Tong Guo, Jian Feng, Pooya Sareh
The ability to accommodate large deformation while maintaining full structural recoverability remains a challenge in the design of lightweight mechanical energy storage materials. Here, we demonstrate through molecular dynamics simulations that pillared graphene, a three-dimensional nanostructure made of parallel graphene sheets interconnected by vertically aligned carbon nanotubes, can achieve an unprecedented combination of ultrahigh mechanical energy storage and complete structural recovery up to 38% compressive strain. This exceptional performance stems from a unique deformation mechanism wherein the graphene layers undergo reversible Miura origami-like folding, generating an extended stress plateau together with pronounced auxetic behavior. Parametric analyses further reveal distinct roles of geometric parameters: inter-pillar distance governs the transition between global and localized folding modes, while pillar height independently modulates the elastic modulus without compromising deformation reversibility. Our findings establish a design paradigm for high-capacity energy storage and mechanical buffering systems, and highlight architecturally guided deformation as an effective strategy for exploiting the elastic potential of carbon-based nanomaterials.
{"title":"Origami folding enables ultrahigh and reversible mechanical energy storage in pillared graphene","authors":"Pan Shi, Yao Chen, Tianyu Xie, Tong Guo, Jian Feng, Pooya Sareh","doi":"10.1063/5.0316430","DOIUrl":"https://doi.org/10.1063/5.0316430","url":null,"abstract":"The ability to accommodate large deformation while maintaining full structural recoverability remains a challenge in the design of lightweight mechanical energy storage materials. Here, we demonstrate through molecular dynamics simulations that pillared graphene, a three-dimensional nanostructure made of parallel graphene sheets interconnected by vertically aligned carbon nanotubes, can achieve an unprecedented combination of ultrahigh mechanical energy storage and complete structural recovery up to 38% compressive strain. This exceptional performance stems from a unique deformation mechanism wherein the graphene layers undergo reversible Miura origami-like folding, generating an extended stress plateau together with pronounced auxetic behavior. Parametric analyses further reveal distinct roles of geometric parameters: inter-pillar distance governs the transition between global and localized folding modes, while pillar height independently modulates the elastic modulus without compromising deformation reversibility. Our findings establish a design paradigm for high-capacity energy storage and mechanical buffering systems, and highlight architecturally guided deformation as an effective strategy for exploiting the elastic potential of carbon-based nanomaterials.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147454403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stabilization of laser frequencies is critical for sensitive Rydberg measurements, including in applications such as dissipative time-crystal (DTC) dynamics, yet conventional approaches often require complex or costly hardware. We demonstrate a compact, low-cost stabilization method using a scanning Fabry–Pérot interferometer (SFPI) to transfer lock a 960 nm coupler laser to an 852 nm Cs reference laser. The lock suppresses coupler multi-MHz free-running drift and improves the Allan deviation by up to an order of magnitude, reaching <75 kHz at τ ∼ 66 s. Applied to DTC oscillations using a Rb 2-photon D2 transition, the second harmonic generated at 480 nm (from 960 nm lock) reduces DTC frequency drift from >20 kHz to a few kHz and lowers instability by more than an order of magnitude with a minimum Allan deviation of 0.2 kHz at τ < 10 s. These results establish SFPI-based transfer locking as a practical and accurate approach for scalable multi-laser Rydberg experiments that require long-term stability in a compact and low-cost system.
{"title":"Stabilization of Rydberg dissipative time crystals using a scanning Fabry–Pérot interferometer transfer lock","authors":"D. Arumugam, B. Feyissa","doi":"10.1063/5.0305148","DOIUrl":"https://doi.org/10.1063/5.0305148","url":null,"abstract":"Stabilization of laser frequencies is critical for sensitive Rydberg measurements, including in applications such as dissipative time-crystal (DTC) dynamics, yet conventional approaches often require complex or costly hardware. We demonstrate a compact, low-cost stabilization method using a scanning Fabry–Pérot interferometer (SFPI) to transfer lock a 960 nm coupler laser to an 852 nm Cs reference laser. The lock suppresses coupler multi-MHz free-running drift and improves the Allan deviation by up to an order of magnitude, reaching &lt;75 kHz at τ ∼ 66 s. Applied to DTC oscillations using a Rb 2-photon D2 transition, the second harmonic generated at 480 nm (from 960 nm lock) reduces DTC frequency drift from &gt;20 kHz to a few kHz and lowers instability by more than an order of magnitude with a minimum Allan deviation of 0.2 kHz at τ &lt; 10 s. These results establish SFPI-based transfer locking as a practical and accurate approach for scalable multi-laser Rydberg experiments that require long-term stability in a compact and low-cost system.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"8 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147393616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jinfeng Yang, Zhunyun Tang, Yongze Xu, Xiaonan Wang, Tao Ouyang, Huarui Sun
Layered NbSe2 has attracted extensive interest as a prototypical system where multiband superconductivity coexists with a charge-density wave (CDW) order. Here, using self-consistent phonon theory to incorporate anharmonic renormalization, CDW critical temperatures in the bulk and monolayer 2H-NbSe2 are calculated to be 66 and 116 K, respectively, in good agreement with reported experiments. First-principles anharmonic lattice dynamics combined with Peierls–Boltzmann transport theory reveals that strong phonon anharmonicity, arising from low-energy special soft phonon modes mediated by the CDW behavior, results in a low lattice thermal conductivity (κL) with weak temperature dependence. Strikingly, four-phonon (4ph) interactions contribute to a dramatic suppression of κL, particularly in the in-plane direction, reinforcing the critical role of strong phonon anharmonicity. These results provide a detailed microscopic understanding of CDW transition and thermal transport in CDW materials.
{"title":"Charge-density wave-mediated soft phonon modes suppress the temperature dependence of lattice thermal conductivity in 2H-NbSe2","authors":"Jinfeng Yang, Zhunyun Tang, Yongze Xu, Xiaonan Wang, Tao Ouyang, Huarui Sun","doi":"10.1063/5.0309984","DOIUrl":"https://doi.org/10.1063/5.0309984","url":null,"abstract":"Layered NbSe2 has attracted extensive interest as a prototypical system where multiband superconductivity coexists with a charge-density wave (CDW) order. Here, using self-consistent phonon theory to incorporate anharmonic renormalization, CDW critical temperatures in the bulk and monolayer 2H-NbSe2 are calculated to be 66 and 116 K, respectively, in good agreement with reported experiments. First-principles anharmonic lattice dynamics combined with Peierls–Boltzmann transport theory reveals that strong phonon anharmonicity, arising from low-energy special soft phonon modes mediated by the CDW behavior, results in a low lattice thermal conductivity (κL) with weak temperature dependence. Strikingly, four-phonon (4ph) interactions contribute to a dramatic suppression of κL, particularly in the in-plane direction, reinforcing the critical role of strong phonon anharmonicity. These results provide a detailed microscopic understanding of CDW transition and thermal transport in CDW materials.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"11 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147393239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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